TMP88CU74F datasheet(95/132 Pages) TOSHIBA

95 / 132 page

TMP88CU74

2003-02-17

88CU74-95

(5) Restart

Restart is used to change the direction of data transfer between a master device and

a slave device during transferring data. The following explains how to restart when the

TMP88CU74 is in the master mode.

Specify “0” to the MST, TRX, and BB and “1” to the PIN and release the bus. The

SDA pin retains the high level and the SCL pin is released. Since a stop condition is not

generated on a bus, a bus is assumed to be in a busy state from other devices. Check

the BB until it becomes “0” to check that the SCL pin of theTMP88CU74 is released.

Check the LRB until it becomes “1” to check that the SCL line of a bus is not pulled

down to the low level by other devices. After confirming that a bus stays in a free state,

generate a start condition with procedure (2).

In order to meet setup time when restarting, take at least 4.7 [

μs] of waiting time by

software from the time of restarting to confirm that the bus is free until the time to

generate the start condition.

Figure 2.10.16 Timing Diagram when Restarting theTMP88CU74

Start condition

SDA (pin)

SCL pin

“0”

→ MST

“0”

→ TRX

“0”

→ BB

“1”

→ PIN

SCL (Bus)

LRB

“1”

→ MST

“1”

→ TRX

“1”

→ BB

“1”

→ PIN

4.7 [

μs] (Min)

2007-10-19

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